In summary, it is clear that because the core sets are going away all expansions will have more of what used to be core set staples: Duress, Naturalize, Negate. This set has at least ten of those cards.
The dragons are mostly junk rares IMHO, and I say 'ouch.' Watch out for the White Blue Dragon, I think Ojutai is the new synonym for money. All of the commands are worth trying. Ojutai's is the best (who doesn't like a card titled 'Money's Command'?).
Good luck pulling the planeswalkers!
I will check these artifacts out when they come out.